From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Metallurgical analysis on the effects of adding chromium and nickel to an alloy during casting.
Identifier | ExFiles\Box 132\4\ scan0073 | |
Date | 27th May 1937 guessed | |
4. removed. Taking results all-round the addition of chromium seems to be a step to be taken. Pearlitic structure appears to be good from the results of other people but this structure is dependant upon several factors, (viz) the correct amount of combined carbon & particularly casting temperature & rate of cooling. The rate of cooling is important so that it will be necessary to have strict control particularly with a casting of varying sections. The elimination of free ferrite from the casting is another point and one thing in favour of the pearlitic structure. Chromium combines in solution with iron & therefore tends to reduce the amount of free ferrite, which should help from the corrosion point of view. Nickel apparently serves no useful purpose from wear point of view but is used to prevent chilling, a small amount may be necessary with the | ||